Malicious PDF — malware analysis report

Static analysis result for SHA-256 54439be49c48899c…

MALICIOUS

PDF

73.6 KB Created: 2021-03-02 21:30:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cf10a4f32776bb154d01459bd5985b9b SHA-1: f3e9962442c6e56b6e1543959aeadef3506e63f5 SHA-256: 54439be49c48899c8ae08ae32cdcff32dd2560bfc6899fc366c2c493bb24817c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=construction+site+office+administrator+job+description PDF link annotation
    • http://semengergel.ru/fijaminokozodugirabeb1l9px.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/didClgd/kedano.pdfIn PDF document text
    • https://cdn.sqhk.co/jawosuzexe/UjaLjgd/star_wars_rebels_ahsoka_episodes.pdfIn PDF document text
    • http://uspeh.icu/ferromagnetic_materials_reportnw6gv.pdfIn PDF document text
    • http://gratoraama.space/26213333348ey73h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_6037d8ff23893.pdfIn PDF document text
    • http://yoganchik.space/free_fake_towing_receiptpv6fl.pdfIn PDF document text
    • https://doxuxipineza.weebly.com/uploads/1/3/0/7/130740192/2740816.pdfIn PDF document text
    • http://rubeatyshop.xyz/break_time_over_memek141w.pdfIn PDF document text
    • http://dvertsoff.ru/electrical_power_worksheet_with_answersz6c9v.pdfIn PDF document text
    • http://lerob.info/lux_tx1500e_thermostat_user_guidewlrrn.pdfIn PDF document text
    • http://sallles.ru/gantt_chart_template_for_final_year_projectbjdfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5ff47e41ec109.pdfIn PDF document text
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/3463585.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/K5jhjbW/the_sims_ps2_cheats_more_money.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 5388 bytes
SHA-256: 7e048dfd0dfcb8496d18eab23328be324cd2c13273ba1fb79933d4f3446dbde9
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 10352 bytes
SHA-256: ee5713eaac028afa2a01f53c48f346ba68e6e2053df0eef8b244b8140f5e2cf8

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